Implement sidebar support for extension action popups

chrome/browser/extensions/extension_action.h

Index: chrome/browser/extensions/extension_action.h
diff --git a/chrome/browser/extensions/extension_action.h b/chrome/browser/extensions/extension_action.h
index 9e73dbc9e0a2564c82742906a0d3c48a0355aff8..ef85c5490cd6780be14858261208ceb512e5919f 100644
--- a/chrome/browser/extensions/extension_action.h
+++ b/chrome/browser/extensions/extension_action.h
@@ -70,6 +70,12 @@ class ExtensionAction {
   std::string id() const { return id_; }
   void set_id(const std::string& id) { id_ = id; }
 
+  // Should open Popup in sidebar?
+  bool open_in_sidebar() { return open_in_sidebar_; }
+  void set_open_in_sidebar(bool open_in_sidebar) {
+    open_in_sidebar_ = open_in_sidebar;
+  }
+
   // Set the url which the popup will load when the user clicks this action's
   // icon.  Setting an empty URL will disable the popup for a given tab.
   void SetPopupUrl(int tab_id, const GURL& url);
@@ -291,6 +297,9 @@ class ExtensionAction {
   // needed for compat with an older version of the page actions API.
   std::string id_;
 
+  // Popup should be open sidebar
+  bool open_in_sidebar_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionAction);
 };